【摘 要】
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The magnetotransport properties and magnetocaloric effects of the compound Mn1.95Cr0.05Sb0.95Ga0.05 have been studied. With decreasing temperature, a spontaneou
【机 构】
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State Key Laboratory for Magnetism, Institute of Physics and Centre for Condensed Matter Physics,Chi
论文部分内容阅读
The magnetotransport properties and magnetocaloric effects of the compound Mn1.95Cr0.05Sb0.95Ga0.05 have been studied. With decreasing temperature, a spontaneous first-order magnetic phase transition from ferrimagnetic (FI) to antiferromagnetic (AF) state takes place at Ts＝200K. A metamagnetic transition from the AF to FI state can be induced by an exteal field, accompanied by a giant magnetoresistance effect of 57%. The magnetic entropy changes are determined from the temperature and field dependence of the magnetization using the thermodynamic Maxwell relation. Mn1.95Cr0.05Sb0.95Ga0.05 exhibits a negative magnetocaloric effect, and the absolute values of △Smax M (T, △H) are 4.4, 4.1, 3.6, 2.8 and 1.5 J/(kg.K) for magnetic field changes of 0-5T, 0-4T, 0-3T, 0-2T and 0-1T,respectively.
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